#ifndef __MEM_H__
#define __MEM_H__

#define K    1024
#define M 1048576

typedef enum { Text, Data, Stack } Id;
typedef enum { Byte, Half, Word }  Size;
typedef enum { C_READ, C_WRITE } c_rw;

struct segment_t {
    Id            segmentid;
    mem_addr      base;         /* starting address in virtual memory */
    unsigned long size;         /* size of the segment */
    host_addr     segment;      /* starting address in real host */
};
typedef struct segment_t Segment;
extern Segment segment[];
extern char Phys_Memory[];

extern mem_word *textseg;   /* text segment */
extern unsigned long textsize;
extern mem_word *dataseg;   /* data segment */
extern unsigned long datasize;
extern mem_word *stackseg;  /* stack segment */
extern unsigned long stacksize;
extern mem_addr pbreak;     /* program break */
extern mem_addr pstaddress; /* program start address */

extern mem_addr sigtramp; /* address of the signal trampoline code */

/* mem.c */
extern host_addr mem_address(mem_addr,c_rw);
extern host_addr mem_address_nullok(mem_addr,c_rw);
extern mem_word read_mem_word(mem_addr);
extern mem_half read_mem_half(mem_addr);
extern mem_byte read_mem_byte(mem_addr);
extern void set_mem_word(mem_addr, mem_word);
extern void set_mem_half(mem_addr, mem_half);
extern void set_mem_byte(mem_addr, mem_byte);
extern void make_memory(unsigned long int, unsigned long int);
extern void expand_data(long);
extern void expand_stack(void);
extern void setupstack(int, int, char *[], char *[]);


#define rnr_mem_word(addr) *(mem_word *)mem_address(addr,C_READ)
#define rnr_mem_half(addr) *(mem_half *)mem_address(addr,C_READ)
#define rnr_mem_byte(addr) *(mem_byte *)mem_address(addr,C_READ)
#define snr_mem_word(addr,value) *(mem_word*)mem_address(addr,C_WRITE)=(mem_word)value
#define snr_mem_half(addr,value) *(mem_half*)mem_address(addr,C_WRITE)=(mem_half)value
#define snr_mem_byte(addr,value) *(mem_byte*)mem_address(addr,C_WRITE)=(mem_byte)value

#define read_mem_word(addr)    rnr_mem_word(addr)
#define read_mem_half(addr)    rnr_mem_half(addr)
#define read_mem_byte(addr)    rnr_mem_byte(addr)
#define set_mem_word(addr, value) snr_mem_word(addr, value)
#define set_mem_half(addr, value) snr_mem_half(addr, value)
#define set_mem_byte(addr, value) snr_mem_byte(addr, value)


#endif __MEM_H__